Author: Uri Blass
Date: 22:12:42 01/02/03
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On January 02, 2003 at 18:36:35, Drexel,Michael wrote: >On January 02, 2003 at 17:52:50, Uri Blass wrote: > >>On January 02, 2003 at 16:39:27, Drexel,Michael wrote: >> >>>On January 02, 2003 at 16:16:05, Dieter Buerssner wrote: >>> >>>>On January 02, 2003 at 15:53:44, Drexel,Michael wrote: >>>> >>>>>Hello Dieter, >>>>[...] >>>>>at which depth do you think it would find the mate? 30/30? >>>> >>>>Sorry, I am the wrong person to answer this question. How should I know? >>>> >>>>>this 'behaviour' has obviously something to do with its superior playing >>>>>strength. >>>> >>>>? >>>> >>>>Regards, >>>>Dieter >>> >>>just wanted to say that this kind of tests (with unreal or unlikely situations) >>>are not important, regarding playing strength. >>> >>>Michael >> >>I disagree. >> >>I believe that knowing to solve the position is an advantage from playing >>strength point of view. >> >>It may be unimportant if white had another win but it is not the case here. >> > >In this special case it is an advantage but how often would such a type of >position occur in the middle game? Shredder 7 and Fritz 8 (Junior and Chesstiger >15 results would be of interest too) are not >able to find the best move in reasonable time. >Im not a chessprogrammer but it seems clear to me that 'comercials' are able >to get deeper into the search, by excluding more variations then most freeware >programs do. hence they often fail to find mates in such positions. I reject this explanation. Most freeware also do not find it. I also use pruning but for me pruning is not the main problem because even if you give movei the position after Qxg6+ Kxg6 movei cannot find that white is better in a reasonable time. pruning is important but good pruning rules should say not prune Qxg6 in that position. I can give logical reasons. 1)white has inferior position without Qxg6+. 2)Qxg6+ lead to some attack for white. conclusion Qxg6+ should be extended becuse it is the only chance. Movei also searches Qxg6+ to relatively smaller depth but it only proves that my pruning rules can be improved. Uri
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